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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4fb1b55b20594a466b0fe6af154252ae1709bc1bf35b3e89a4309fd25b7acd23' 
  AND token = 'MRBOLm5MajkfiEILJ9v5kAV2Y/A6Xx0Oau6AOdNNg6o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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