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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ce15264673c8a3c1d8506b3501e5f01e22ab030e77597a9a4a919fb5fa5def1' 
  AND token = 'KT8A/FB6RBBLO+dBLeznNc6VNiRtWZUW+jmeeD1dZ6M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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