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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce181088db9c987d6d55c5f49cbccb41c46bfc277e28df072da7746fe1c53011' 
  AND token = 'KMHuDuzj2ROVJ6ZN40HGjdZ2W5XvLGy6ZNhn36vWG6c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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