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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85b6313170fa71a95025f4b5903b2bd63ba93ec772d857c9ee873dcfd8740ed7' 
  AND token = 'wjosdRGEXVG/ik8rEJquObENx5k7ojClONzkgz8hgJ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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