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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b0285ce9dd0d8e7d51fe80de644c4f83fecd1e5af7f545a121c3f4c638eddcd' 
  AND token = '8Yf/Rw+iQ4tUruyCQNZiTDCY8bmymmPxRrYso8KMkOg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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