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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56d3372a0bd6b1a5fc6ed7730a5a37fb2aac66e4e387c51a21473fc459f06783' 
  AND token = 'tUpMUE0OUxUbJKhRVf7g3u6a1VXuVUQ/JEPIvlir4fY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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