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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84e534fc4917a12bc0461112e60c1d2eec288947a921a8d9a2fd4d43119df90b' 
  AND token = '5HeRVq1mY9MEPHCDiyhQzBACAIc9r+7b98FSXBxbc9o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00063

JSON explain

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