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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94a6a0b599175e0b4b7f0003e7773bdc8c89b1b5c5bfb9736e71e45e9e3fdc3d' 
  AND token = 'gfVfTdLPoAGWUPHBUKS7SHZoe59gV+xurrhFL265WUU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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