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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2cc863179a36212536902e5559a6a7bb1b283feb1d9cab735e59ac627258c3d9' 
  AND token = '5T+oaPtIq5iYz0Y6KyZOAW3Wg29W3Fo6qc4T6HjUTGg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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