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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c8f2f111407c54121ac1c6f5a6bf3513f3f196896de559354bd3c81d4e0092f3' 
  AND token = 'c8L90aTWHM/4v6fRCvzG7ipqFv0ULj9lxCilSJFcRvY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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