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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '698fa601eed9aa1d95de68433df5166cfa8c0404d1acfc88307ad8799fce198b' 
  AND token = 'Z/Pk0I8Zmdb5BKHZ2X7gKAE8FudSfP6LqFsP/eqd0sk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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