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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '75114ff40b5649696b8246aa062a9f4618683e541fdc9c1a7085d076ce12f3a6' 
  AND token = 'J/Bt6p2BlZJMXzdp0rbspb9d16VBj4WNejGn+cTxmT4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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