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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9cba8125ea8ed4ffcd6b5308164ff5333c1a31b3078eb0b6b04908730b69f2cd' 
  AND token = 'H0A7k66y7h3ET+bXUXhQFZACyACQmTMJJWyW7XiUFKU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}