SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a5b11d9819600775dd84d136266fe830e4c2ffd1a8fe5fa84d36128d164ab7d' 
  AND token = 'oAAgooAV2Gv9YWj54voMYr2uvFKigpH5+2arzVGd5Bw=' 
  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"
    }
  }
}