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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a59c60c3e6d789ab115299f73b0ff09ba65bf75064d5a7161b6be63e730a46c4' 
  AND token = 'LExIuAIVbkeevYHq8UxCzras4kFufOhSH05G+IfLpKg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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