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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3a37db51e6b96ae4db7d93bc7a25e37e11bd2edeb43e20ccf6d970ad5a780d6' 
  AND token = 'q89srBaD4APb2loKVai2Dh/m3LNfScwvIubMQOCoqCQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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