SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ca9d33842eee33158194f167e23db980231f2a250a36d901a767a514fa4e3c8' 
  AND token = 'uwf5YrGYz1Rg7Xv4fnCMUBs4jBuLFftvF/lEPqxroIs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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