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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fefa86e716a2b7db304b7aacf7ea36fb0af2f5515bfc5f4938a03b653fcab7cc' 
  AND token = 'jM0JeTtIP99YJl6YerHcwNBh1U4XPrrGqcGD7XovXW4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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