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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d00b30dce9f00b89f7acc4daf53ffe9bcc69af0a1fddc4836961e710cd13acc' 
  AND token = '8ikQCDMTKwgG+gSkHR1z7L+WfjklMyqscFwnDc9ySxg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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