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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8618e6e838696a11c2ae0a8ce7fc0add8dee7043f8ac53ed0196b0050d3af844' 
  AND token = 'jh4WOv+SdUH26nC5UsAZ73yEPvswVKtmJ1h4LM7bW/M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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