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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3bc603f4220f6dcb5ff1a8d11141946926cf17080c50988659fcca472613326d' 
  AND token = 'P3sw+6fmypAA4n2iPG7SQ702+vfxSISly9NDxTG5WhE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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