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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b62cae6e56de704b3bb6b7550ed37f9d2a8cdf506edd44781f8051d5e2b36ef' 
  AND token = 'RE5xiVM+2wKYP3Hqw0EuexAmb57JGvo4VrBUi9TUiYc=' 
  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"
    }
  }
}