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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2a9cacd7cd46e8fe55b244128477bc7a0f98be612e524dc8f3924e9e937de3e' 
  AND token = '7SnVEs2A5FCc0QiIkvbLX26fyfdppllBli/ImlXfnjc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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