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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9bd09bceabde56dbb42462e8efd292acc4ac18d3e04b060b77bbbd77ccbdb142' 
  AND token = 'IFlfNDDO0KIeuA7/FOHjsfjbDfMRIgwu0JX/D4vtnzU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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