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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dbcf648f025b73b005526426a587688beac5fe67ce2085e095c28f1fc90c8b2e' 
  AND token = 'lzZZL7lR3BBXmThe5Aa67Jj/iUmFJEvk49o18L1Yyik=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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