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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6cb81440f1777c077d78404bf9f9b6119b2bf17d8634b6fa3cdad618af21408a' 
  AND token = 'V6bI2B6pBNkZYZ0X6qsORSpJ2qns0L55nK1+kE71NPA=' 
  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"
    }
  }
}