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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed83eddbc0268e26861f5a98d89c405c4e70134eab697a3ea646b6af17fcd19a' 
  AND token = '8+7ynDuKbz+NX29zulXdX+SxlnUl6NGGz+FCugtdptI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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