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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6ea6ba3562dee4ff8ea0fbbe252ba60794af2703ae7fa5d36037a8535978f76' 
  AND token = 'J171Vvivv1ug2HPVZ7czbRDw9eJDTgWIAcXOl2owH8I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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