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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a3b1dfa0bde7a9773dd9bafd091bc8af1ba937769f6ba99c691809008b9601e' 
  AND token = 'Z65qsDM9Ry+q/7AsjMSJ6DwbY9avkGhq+Zj5TwFN5DU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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