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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3e763108bc14f4400869881273c2b01aa7ce1cefc8df4e8646f1b5540575643' 
  AND token = '5o6vy0cdY46UkvGJI3r/ZZui3VR+lu4StFFxDl3oUyM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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