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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e8b1c576f53a12d39cabff13caae03f558eb3846ba7e1e14d295fc3395c6da6' 
  AND token = 'lGjzlmVouP1tAYlT5Gxbmgg6jNbyntnQ0NlkjlJf8zI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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