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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd33ecd15fc8c6cf68d7c63c6a76416e1e6d359b94c27a5e5ff6f335f0632fc44' 
  AND token = 'FE7+KK3R2KUmAsabfChTif99NQW0zZLTQViwLD1Beis=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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