Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94eebe1952ce9cdee7ba8d819ce752fd0a93490bca881f3642d9be4afd5aa83b' 
  AND token = 'nMghD8H+k36dFU+NEmCmix79FPfqzRf1ExZJrm/JVs4=' 
  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"
    }
  }
}