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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ceea928ebeeb2d568e9e7bea26c1b0658a3b5fb4d8b36c3888cdda04d473d8c7' 
  AND token = '9r/0HCfdZQdqoqJLzWB/z1/p4+HsDM4F1REGrIIu0Bc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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