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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3ffbb4d01bf4a984e7b2dbaf928b537a1c5a792365cc4545afd5daf307875d6' 
  AND token = 'tz/4RF01AbGMm8ztF/WTqVZ5D9osb0EuVWJEa9Svktw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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