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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd51bb1677a77ce3859d60ebe16e12ab60679c6e9e693cc39472d42a49299badb' 
  AND token = 'bQhx/OSyEGZ/O/iBKJHYjA0RFJ103oD7QpPIrjP1iK4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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