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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '64768d8b0379e48d881ce59b9442b585329094d3639423b8df5773db28648f14' 
  AND token = '4t6RcDHrg6pH0IRcLcDH9lKSj/BVMy9OFc0NSlnUlrU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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