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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d829b3f02772af047c6c6d4e7a56565c22f1415afc5b20d7a361e73f518c799' 
  AND token = 'kaCJzMSiXhSfN6Ij41fXFi78HbX7M+fbYMNA3d2QAaA=' 
  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"
    }
  }
}