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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ae7aea845e12467b450b5ba8f3775ce8ac4504bc86a6a65769fe86e83926199' 
  AND token = '4ZvVuCHLyFP3fOSWOZC9TUU/dk9dvVljHloMKFa1tGw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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