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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4be877a37125a085c0bfeab6e7616e0469e9b81d785629daa0d3123bf278eb93' 
  AND token = 'DtiQJuR4yb8MH+M/o0NWXUmAy7VeICvZOU+YLkhf3Z4=' 
  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"
    }
  }
}