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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3745bf6a50bacda9962b9b3eae7227a8c47d46dd26170e4937d48ab1334806cd' 
  AND token = 'jqZwKfwJxcCyh384GyyaP5sTYOqu+UMD9igfaUu4bSQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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