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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7fc7a860689b15c3e2708b292c8f9a8704c5eec64f95e0e50584b4378fdf7dac' 
  AND token = 'CWrXG02Wj7+HUeqTjkHpf8zeI1sc4gIHjPsdnHpFNQs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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