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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6c6600619c21453587c698a8055dab147f59d55a51a82a04611a6a027f8288e' 
  AND token = 'FzD9KSUYOh+7R+N+B3RUjLrythiLk7i9KT6L8Zw29i8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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