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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e100d9625e9c0b6e53b0374f73986e0dc2d16e5ee171bd37b7097e5ebf30909' 
  AND token = 'ngYgPI2bkKTB3KBMk05XaemfFfkvSRAb7bZPXIvvEFI=' 
  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"
    }
  }
}