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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09dc12f99b592ea593902742773a89939057e35df91e356948393c167b4b3cbe' 
  AND token = 'YXKsDO7T4gQkmAG96cpoTktiPBYUFg0CHu5C8Xu/Y6g=' 
  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"
    }
  }
}